Other amendments include abolishing the death penalty for apostasy and no longer requiring women to have permission from male family members to travel outside the country with their children.
World leaders, who have pledged to end FGM by 2030, are "seriously off track", rights group Equality Now said, as it called for global efforts to end the practice to be broadened to more countries.
More than 6,000 women and girls who visited a doctor, midwife, obstetrician or another public health service in England between April 2017 and March 2018 had undergone FGM at some point in their lives.
Following a temporary ban on female genital mutilation during the Ebola crisis, FGM is on the rise again in Sierra Leone. Worldwide, some 200 million girls and women have had their genitals cut, whether by force or by choice.
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